It takes some serious guts to stray from a starting lineup that went 50-7 during the regular season.

But that’s exactly what the Warriors did Thursday night at Quicken Loans Arena, making a series-altering adjustment that led to a 103-82 victory. The huge win evened the NBA Finals at two games a piece as it shifts back to Oakland.

In an attempt to regain the feverish pace with which they played all season, the Warriors subbed swingman Andre Iguodala into the starting lineup for center Andrew Bogut and pushed the tempo every time they had a chance.

The Cavaliers tried to match the Warriors’ tempo and urgency all night but had no chance against a group that was suddenly transformed into the same unselfish offensive team and the hounding defensive team that dominated the regular season.

After deciding not to defend Tony Allen in Game 4 of the Western Conference semifinals and erasing a 2-1 deficit on the road in Memphis, the Warriors’ Game 4 adjustment in Cleveland might have taken even more gumption.

The Warriors starting lineup of Stephen Curry, Klay Thompson, Harrison Barnes, Draymond Green and Bogut was the second-best since the NBA began tracking starters in 1970-71, and the Warriors went 9-6 without Bogut during the regular season. He played only 2:46 on Thursday.

But something drastic had to take place. The Warriors couldn’t afford to fall behind 3-1 in the series — something that has happened to 32 teams, all of which lost the NBA Finals.

Instead, the Warriors tied the series and maintained their roll of going without three consecutive losses all season. Game 5 of the best-of-seven series is scheduled at 5 p.m. Sunday at Oakland’s Oracle Arena.

Iguodala responded to his first start of the season, going for 22 points and eight rebounds and getting the occasional double-team help on LeBron James to limit the King, who had been averaging 41 points in the series, to 20 points on 7-of-22 shooting.

Curry at the center of two postseason records. He scored 22 points to pass Rick Barry for the franchise’s postseason mark (521 scored in 1967), and his first of four three-pointers gave the Warriors 205 in the 2015 postseason — the most in NBA history.

The Warriors also got 17 points, seven rebounds and six assists from Thompson, 12 points and eight rebounds from Barnes, nine points and five rebounds from David Lee and seven points, eight rebounds and four assists from Shaun Livingston.

Cleveland, at first, laughed at the Warriors’ adjustment to a small starting lineup, scoring the game’s first seven points and outrebounding the Warriors 5-1 during the two-minute span. But the Warriors did most of the laughing for the rest of the quarter, tying it 20-20 on a three-point play by Green and taking a 31-24 lead in the second.

The first quarter was played at a breakneck pace, and the Warriors returned to playing offense like they did during the regular season. They had nine assists on 12 made field goals and didn’t commit a turnover as the Cavaliers frantically tried to match the Warriors’ tempo and physicality.

Green made a three-pointer to give the Warriors a 44-32 lead with 6:06 remaining in the second quarter, and as he retreated to defense, he spun and screamed, “I’m back.”

Bogut committed three fouls in 2:46, including one that sent James sprawling into the photographers along the baseline and left him with gashes on the right side of his head.He stayed in the game and had 10 first-half points on 4-of-12 shooting as the Cavaliers shot 37 percent. The Warriors, who hadn’t scored 50 points in any first half of the series, reached the mark with 1:35 remaining, when Lee scored on a hook shot to give his squad a 50-38 lead. Curry drove past Matthew Dellavedova for a layup with 3.5 seconds left to send the Warriors into the break with a 54-42 lead.

Curry made a pair of free throws with 8:54 remaining in the third quarter to put the Warriors ahead 63-50, but Cleveland responded with a 12-2 run and trimmed its deficit to 65-62 on a Dellavedova to James alley-oop with 5:11 left. The Warriors got beat 17-6 on the boards and 14-2 in paint points in the third quarter, but Curry hit a three-pointer with 17.9 seconds left to send the Warriors into the fourth with a 76-70 lead.

The Warriors opened the fourth quarter on a 9-2 run, including a stepback three-pointer by Curry that made it 85-72 and sent the bench into a frenzied celebration. The Cavaliers never recovered as the Warriors’ subs pushed the lead to a game-high 23 points.